SURFACE PHOTODEGRADATION OF POLY(VINYLIDENE FLUORIDE) BY INNER-SHELL EXCITATION

Koji Kamiya Okudaira, Eiichi Kobayashi, Kazuhiko Mase, Satoshi Kera and Nobuo Ueno
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Koji Kamiya Okudaira: Department of Electronics and Mechanical Engineering, Faculty of Engineering, Chiba University, 1-33 yayoi-cho, Inage-ku, Chiba 263-8522, Japan
Eiichi Kobayashi: National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan
Kazuhiko Mase: National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan
Satoshi Kera: Department of Electronics and Mechanical Engineering, Faculty of Engineering, Chiba University, 1-33 yayoi-cho, Inage-ku, Chiba 263-8522, Japan
Nobuo Ueno: Department of Electronics and Mechanical Engineering, Faculty of Engineering, Chiba University, 1-33 yayoi-cho, Inage-ku, Chiba 263-8522, Japan

Surface Review and Letters (SRL), 2006, vol. 13, issue 02n03, 259-263

Abstract: Poly(vinylidene fluoride) (PVDF,–(CH2–CF2)n–) shows the effectiveH+desorption induced by the irradiation of photon corresponding to the transition from carbon(C)1s toσ(C–H)*. In order to clarify the effect of theC–Hbond scission by the irradiation, near-edge X-ray absorption fine structure (NEXAFS) spectra and the kinetic energy(Ek)distribution of desorbed ion were observed. By the irradiation of photon nearC1s region, a new peak appears in theC1s NEXAFS spectra at photon energy of 285 eV, which is about 3 eV lower than that of the lowest peak in the NEXAFS spectrum of the pristine PVDF film. The appearance of the lowest NEXAFS peak of irradiated PVDF film is assigned to the transition toπ*. It indicates that the irradiation of photons nearC1s region introduces carbon–carbon double bonds into the backbone chain of PVDF. At early stage of X-ray exposure the yield of desorbed ion with lowEk(~ 2 eV) decreases rapidly. The ion with lowEkis assigned toH+desorbed from the sp3-hybrid state, which is characteristics of the pristine PVDF. It indicates that formation of double bonds in PVDF backbone chain makes the number of sp3-hybrid state decrease. This variation occurs by irradiation of photons corresponding to the transition fromC1s toσ(C–H)*more rapidly than that to the transition toσ(C–F)*.

Keywords: Photodegradation; PSID; poly(vinylidene fluoride); NEXAFS (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008074

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